Quantifying methane emissions from reservoirs: from basin-scale to discrete analyses with a focus on ebullition dynamics
Quantifying methane emissions from reservoirs: from basin-scale to discrete analyses with a focus on ebullition dynamics
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量化水库甲烷排放：从盆地规模到离散分析，重点关注沸腾动力学
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
S. Tonya
中科院分区：
文献类型：
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作者：
Del Sontro;S. Tonya
甲烷排放途径及其重要性进行了量化，在为期一年的调查温带水电站水库。使用气体捕集器的测量表明非常高的沸腾率，但由于沸腾的随机性，质量平衡方法对于推断系统范围内的甲烷来源和损失至关重要。沉积物中的甲烷扩散一般较低，季节性稳定，并没有考虑到水库排放中测得的高浓度溶解甲烷。水温和所观察到的溶解甲烷浓度之间的强正相关性使我们能够使用系统范围的质量平衡来量化气泡溶解的溶解甲烷添加。最后，知道由于气泡溶解的贡献，我们使用气泡模型来估计气泡排放直接到大气中。我们的研究结果表明，总的甲烷排放量从湖沃伦是平均>150毫克CH4 m d，这是有史以来最高的记录为中纬度水库。在这个有90年历史的储层中发现的大量依赖于温度的甲烷排放表明，温带水体可能是一个重要但被忽视的甲烷来源。
Methane emission pathways and their importance were quantified during a yearlong survey of a temperate hydropower reservoir. Measurements using gas traps indicated very high ebullition rates, but due to the stochastic nature of ebullition a mass balance approach was crucial to deduce systemwide methane sources and losses. Methane diffusion from the sediment was generally low and seasonally stable and did not account for the high concentration of dissolved methane measured in the reservoir discharge. A strong positive correlation between water temperature and the observed dissolved methane concentration enabled us to quantify the dissolved methane addition from bubble dissolution using a system-wide mass balance. Finally, knowing the contribution due to bubble dissolution, we used a bubble model to estimate bubble emission directly to the atmosphere. Our results indicated that the total methane emission from Lake Wohlen was on average >150 mg CH4 m d, which is the highest ever documented for a mid-latitude reservoir. The substantial temperature-dependent methane emissions discovered in this 90-year-old reservoir indicate that temperate water bodies can be an important but overlooked methane source.
影响因子：
11.6
作者：
Kindler, Reimo;Siemens, Jan;Kaupenjohann, Martin
通讯作者：
Kaupenjohann, Martin